Xue Sheng
All weight is underside
I was approaching that as a mental exercise as well. Theoretically, how would you try to get concepts across without some kind of form, is basically what I was asking.
Just thinking about it I can only speculate that in the beginning it would be rather boring training for most.
The Xingyi bits are standing training which is far from exciting and generally painful and Xingyi Neigong which is not all that exciting, working on internal and at times it hurts the rest is Sanda which would be pretty much a whole lot of drills, which are rather repetitive and painful and then physical training, sit-ups, push-ups, pull-ups kind of thing. Later you get into 2 person apps and sparing.
The key however, IMO, would be to get the internal to a point where the physical training worked at a more internal level and that would take a lot of time.
What you could possibly end up with is a MA that is far from pretty to watch, with no actual forms that is rather direct, fast and hits like a truck with Qinna and Shuaijiao. Not all that different from other CMA styles actually